Intrathoracic Research Articles

Evaluation of the associations of pulmonary vein vertical diameter, cardiothoracic ratio, and atrial fibrillation combined hiatal hernia.

Recent studies have suggested that there may be a relationship between hiatal hernia (HH) and atrial fibrillation (AF), but the specific mechanism is unclear. The aim of this study was to explore the clinical characteristics associated with HH and AF and to identify the potential relationship between the 2 diseases. The study comprised 180 patients with HH, of which 54 had AF. Every patient had chest computed tomography to quantify the cardiothoracic ratio, HH volume, thoracic cavity volume, and diameters of the pulmonary veins. The clinical data of all patients was acquired through an electronic medical record system. Patients who experienced AF had a noticeably smaller total pulmonary vein vertical diameter (TPVVD) and a higher cardiothoracic ratio compared to those who only had HH. Logistic multivariate regression study demonstrated a significant association between TPVVD, cardiothoracic ratio, and AF in individuals with HH. This study established a correlation between TPVVD, cardiothoracic ratio, and HH in conjunction with AF. Patient with HH who had a thinner TPVVD and a bigger cardiothoracic ratio were found to have a greater likelihood of suffering from AF.

A case of refractory chylothorax due to an unenclosed esophageal hiatus after subtotal esophagectomy treated with lipiodol lymphangiography

BackgroundChylothorax, a rare but serious complication following esophagectomy, can lead to dehydration, malnutrition, and even mortality. Surgical intervention is considered when conservative treatment is ineffective; however, in some refractory cases, the cause of chylothorax remains unclear. We report a case of refractory chylothorax caused by abdominal chyle leakage into the pleural space via an unenclosed esophageal hiatus.Case presentationA 66-year-old man was diagnosed with advanced esophageal squamous cell carcinoma. The patient underwent robot-assisted thoracoscopic subtotal esophagectomy in the prone position with retrosternal gastric tube reconstruction following neoadjuvant chemotherapy. The thoracic duct was ligated and resected because of tumor invasion. Chylothorax and chylous ascites were observed 2 weeks after surgery but did not improve despite conservative management with medications and drainage. Lymphoscintigraphy through the inguinal lymph node showed tracer accumulation in the fluid in both the abdominal and pleural spaces. Lipiodol lymphangiography revealed abdominal lymphoid leakage, but no leakage was detected from the thoracic duct or mediastinum. We considered that the chylothorax was caused by chylous ascites flowing into the pleural space via an unenclosed esophageal hiatus, and we performed surgical intervention. Laparotomy revealed abdominal chyle leakage and a fistula at the esophageal hiatus with the inflow of ascites into the thoracic cavity. Lipiodol lymphangiography was additionally performed for treating abdominal lymphorrhea after surgery, and resulted in the improvement of the chylothorax and ascites. The patient was discharged with no recurrence of chylothorax or chylous ascites.ConclusionsRefractory chylothorax can occur due to chylous ascites flowing into the pleural space via an unenclosed esophageal hiatus. When the site of chylothorax leakage is unclear, the possibility of inflowing chylous ascites via the unenclosed esophageal hiatus should be explored. Esophageal hiatus closure and lipiodol lymphangiography could be effective in treating refractory chylothorax of unknown cause after esophagectomy.

Composite mesh a novel innovative bridge approach for refractory pancreatic effusion - sequelae of porous diaphragm syndrome: Case series

Introduction and importanceManaging refractory pancreatic effusion due to porous diaphragm syndrome (PDS) is a challenge. Various surgical interventions such as repairing the defect, sealing with fibrin glue, performing parietal pleurectomy, and talc pleurodesis have been reported however, the use of composite mesh placement in treating PDS has not been described in the literature. Case presentationAll three male patients with a low body mass index were diagnosed with pancreatic disease as described in cases 1–3 and associated pancreatic effusion. These patients required medical treatment as an initial approach and surgical intervention in the form of decortication, sterilization of the thoracic cavity with 20 % betadine and normal saline in the ratio 1:4, followed by warm normal saline washes and composite mesh placement for PDS followed by endoscopic retrograde cholangiopancreatography (ERCP) as a pancreatic intervention after 3 weeks. Only one patient underwent sphincterotomy, while the other two patients had no abnormality on ERCP. Post-operative follow-ups at 3, 6, and 12 months were uneventful with no recurrence. Clinical discussionThe mechanism for pancreatic effusion is explained by pancreatic duct disruption followed by enzyme leak leading to pancreatic-pleural communication mediated by PDS. Various studies have described their role in treating PDS, even thoracoscopic pleurodesis requiring prolong chest tube and repeated talc slurry for better outcome. However, to address this, we performed the above procedure as a bridge approach followed by a pancreatic intervention. ConclusionThoracic intervention with composite mesh can serve as a bridge procedure before future pancreatic intervention or surgery.

EP267 - Patient with Pneumomediastinum and Pneumoperitoneum – Importance of Human Factors

Abstract Clinical assessment 70-year-old lady presents with one-day history of dyspnoea, chest and abdominal pain. She was recently discharged following a three-week hospital admission with fall related traumatic rib fractures and hospital acquired pneumonia. Her abdomen was soft and non-tender. CT scan with oral and IV contrast demonstrates pneumomediastinum and pneumoperitoneum with connection at diaphragmatic crura. Management Patient was managed conservatively however two days after admission her CRP climbed to 150 and clinical suspicion remained high. Repeat CT scan over the weekend demonstrated increase in the pneumoperitoneum and decrease in the pneumomediastinum with a collection around sigmoid colon. Trainee raised concern to consultant and a laparotomy was done. Operative findings showed perforated sigmoid colon with faeculent peritonitis of unclear cause. Hartmann’s procedure was done and patient continued post recovery in ITU. Discussion This case demonstrates the complex varying presentations of our elderly co-morbid population. The presence of air in thoracic and abdominal cavities with unknown cause weeks after the fall was suspicious. Hence, the team communicated well from top-down and likewise from weekday to weekend. Low threshold for escalation and high index of suspicion enabled a re-scan which proved to be life-saving for this patient. Identifying complicated cases where errors can occur is a critical first step. Clear communication among staff, accurate documentation and addressing the patient concerns enabled the surgical team to navigate the complex disease process and ensure safe patient care.

WP2.14 - Lung Mycetoma - Chronicles from the Pandemic

Abstract Introduction COVID-19 is a global pandemic which obeys no geographical borders. Post Covid pneumonia sequalae is still an unpredictable course especially with patients with a pre-existing lung compromise. In such scenario, a cohort of patients must also be looked for a fungal infection. Case Study A 31-year-old male presented with history of fever, hemoptysis, and weight loss for 1 month. He suffered from Covid-19 pneumonia 3 months back. He was also diagnosed with Pulmonary tuberculosis 4 years back. Examination revealed right sided tracheal deviation with dull percussion note on the upper and middle zones of the right side of chest. Pulmonary function tests showed a restrictive pattern with a FEV1/FVC ratio of 0.9 (FEV1=2.02, FVC=2.22). Transthoracic echocardiography revealed dextrocardia, moderate TR, and a pulmonary arterial systolic pressure of 25 mm Hg. Contrast enhanced CT scan of thoracic cavity showed reduced right hemithorax, well-defined thick-walled cavities in the upper and lower lobe of the right lung and a ground glass appearance in the bilateral lower lobes. A diagnosis of Lung mycetoma was made along with post covid-19 pneumonia changes. Right posterolateral thoracotomy and right pneumonectomy was performed. Per-operatively, a collapsed lower lobe and stony hard upper and middle lobes of right lung with associated fungal balls were found. Patient was clinically well after a 30-day follow-up period. Conclusion Covid-19 patients with pre-existing pulmonary co-morbidities should be followed with caution and pulmonary symptoms in the post pneumonia patient should raise the suspicion of fungal infections as well.

The contemporary approach to chylothorax – Single-center experience with the proposal of a management algorithm

Objectives: Chylothorax is a relatively rare condition of lymphatic fluid accumulation in the thoracic cavity due to a leakage from the thoracic duct or its tributaries. Patients present with dyspnea, malnutrition, and immunosuppression. Treatment can be conservative or surgical, depending on etiology and clinical course. The optimal management algorithm for chylothorax is still controversial. Methods: This is a ten-year period retrospective study of all patients with chylothorax treated at our Department of Thoracic Surgery. Results: A total of 14 patients were identified for the study. Nine patients had chylothorax after lung or esophageal cancer surgery. Four patients had chylothorax in advanced lymphoma. One patient had chylothorax after blunt chest trauma. A conservative approach was initiated in most patients (92%), including pleural drainage, nil per mouth, total parenteral nutrition, and somatostatin 0.1 mg bid subcutaneously. Surgical treatment was indicated in patients with thoracic drain production >800 mL per day beyond the fifth day of treatment and those with blunt thoracic trauma. Two patients had thoracic duct ligation via right-sided thoracotomy, and five patients had video-assisted thoracoscopic thoracic duct ligation with the immediate arrest of chylous leakage. Conclusion: Chylothorax should be treated conservatively initially. Surgical treatment should not be delayed beyond the fifth day in case of failure. In our series of patients, a video-assisted thoracoscopic approach for thoracic duct ligation proved to be minimally invasive, highly efficient, and well tolerated. Therefore, it should be the preferable route of surgical treatment.

Resection of a giant intraspinal and extraspinal schwannoma with cystic change using a two-step surgery: a case report

BackgroundSchwannomas originating from the intravertebral canal rarely extend into the paravertebral region or form large masses. There are few reports on such medical cases, and their clinical diagnosis and management are poorly understood. Here, we report a case of an intraspinal schwannoma with a giant extraspinal mass in a middle-aged Chinese woman and the clinical implications of the symptoms, diagnosis, and treatment of thoracic vertebral schwannoma.Case presentationA 59-year-old female patient who presented with sudden lower limb numbness and difficulty in walking was referred to our department. Magnetic resonance imaging (MRI) revealed a tumor compressing the T11-T12 spinal canal and extensively invading the left thoracic cavity to form a giant paravertebral mass. Schwannoma was diagnosed after intraoperative pathological examination, in which tumor cells were immunoreactive to S100 and Sox10 but negative for smooth muscle actin (SMH). Intraspinal mass resection through the posterior approach and extraspinal chest mass resection under video-assisted thoracoscopy through the left lateral approach were performed simultaneously, and instrumentation was used to maintain thoracic spinal stability.ConclusionIn patients with large schwannomas, customized treatment plans are crucial. Tailoring the approach to an individual’s specific condition by considering factors such as tumor size and location is essential for optimal outcomes.

743. HIATUS HERNIA AND GASTRO-OESOPHAGEAL REFLUX DISEASE. DOES SIZE MATTER?

Abstract Background Hiatus hernia occurs when part of the stomach bulges into the thoracic cavity through the hiatal opening of the diaphragm. In our study, we aimed to assess the impact of the hiatal hernia size on DeMeester score, symptom correlation, and presence of pathological reflux on PH studies. The study also looked at the impact of various characteristics including age, smoking, alcohol consumption, body mass index (BMI), and presence of oesophagitis and/or dysmotility on DeMeester score, symptom correlation, and presence of pathological reflux on PH studies. Methods The study was conducted in an Upper Gastrointestinal surgery unit located in the North West of England. All patients aged over 18 who underwent laparoscopic fundoplication for gastro-oesophageal reflux disease between January 2017 and June 2023 were included. Patients who underwent fundoplication for para-oesophageal hiatus hernia, those who had fundoplication as a complementary step to Heller’s cardio-myotomy, or those who underwent revisional surgery were excluded. Results A total of 115 patients with a median age of 54 were included. Patients’ age was found to have a statistically significant association with hiatus hernia size above 2 cm, DeMeester score, and Symptom Association Probability with a P value of 0.011, 0.021, and 0.030 respectively. Hiatus hernia size above 2 cm was found to have a statistically significant association with pathological reflux (P=0.017). Smoking association with DeMeester score was found to be significant (P=0.027). Hiatus hernia size was not found to have a statistically significant association with DeMeester score, Symptom Index, or Symptom Association Probability (P=0.115, 0.315, 0.904) respectively. Conclusion Hiatus hernia size above 2 cm was found to have a statistically significant association with pathological reflux on PH studies but not statistically associated with elevated DeMeester score above 14.72 or symptom correlation indices. Thorough endoscopic assessment in addition to detailed oesophageal physiological studies are mandatory to evaluate patients with gastro-oesophageal reflux disease prior to considering surgery.

Open-chest cardiopulmonary resuscitation through a transdiaphragmatic approach in dogs: a cadaveric study to describe the surgical approach and manipulations.

To describe the detailed surgical procedure for open-chest CPR (OC-CPR) through a transdiaphragmatic (TD) approach during planned laparotomy and to evaluate the procedure time and damage to organs. 7 mixed-breed canine cadavers. The procedure was divided into 3 stages. Durations for each of the 3 stages of the procedure and total time from diaphragmatic incision to the end of Rumel tourniquet application were recorded. Subjective assessment of ease of procedures and postprocedural physical evaluation of thoracoabdominal organs were also performed. Mean time from diaphragmatic incision to pericardiotomy was 15.1 seconds (SD, 4.0). Performing 10 cardiac compressions took 12.0 seconds (SD, 1.8). Dissection of the aorta and application of a Rumel tourniquet took 130.4 seconds (SD, 52.2). The mean total time from start of first procedure to end of last procedure was 157.6 seconds (SD, 21.5). The mean length of diaphragmatic incision was 11.5 cm (SD, 2.2). Lung laceration was identified in one dog, and liver laceration was identified in another dog. The mean ease of pericardiotomy was 10, and application of a Rumel tourniquet was 4 (SD, 1.9). There was no instance of abdominal organs moving into the thoracic cavity during the procedure in any of the dogs. Resuscitation techniques during TD OC-CPR can be performed with acceptable timing and effort, except for aortic Rumel tourniquet application, which was difficult and time consuming. Avoidable damage to thoracoabdominal organs can occur.

606. THE CHANGES OF THORACOSCOPIC OR LAPAROSCOPIC APPROACH FOR SPONTANEOUS ESOPHAGEAL RUPTURE IN JAPAN

Abstract Background The surgical treatment for esophageal rupture includes various approaches such as thoracotomy, laparotomy, thoracoscopy, and laparoscopy. These approaches aim to: Suture the perforation site, sealing it with omentum. or esophageal resection and reconstruction. Cleanse and drain the mediastinum or thoracic cavity. Adding gastrostomy or intestinal as needed. Many reports showed the usefulness of minimally invasive surgeries. In this study, we added our cases and discussed the surgical techniques and outcomes. Method I searched for reported cases in PubMed and the Journal of Health Care and Society and supplemented them with my experimental cases for analysis. All reports published between 2001 and the end of 2022 were included in this study. Results From 2001 to 2022, there have been 15 reports (16 cases) of idiopathic esophageal rupture using arthroscopic techniques, including our cases, 14 cases in men and 3 cases in women. The ages of the patients ranged from 39 to 78 years (mean 61 years, median 61 years), and the rupture sites were the lower esophagus in 15 cases (88%) and the middle part in 2 cases (12%). The time from onset of symptoms to surgery ranged from 4 to 77 hours. The approach method was thoracoscopy in 7 cases (41%), laparoscopy in 8 cases (47%), and a combination of thoracoscopic and laparoscopy in 2 cases (12%). Complications of Clavien-Dindo classification IIIa or higher were observed in 3 patients (18%). There were two cases each of thoracoscopic and laparoscopic complications in which complications were observed. The time from arthroscopic surgery to discharge was 12-120 days (mean 36.7 days, median 30.5 days). For cases with a thoracoscopic approach, the period from surgery to discharge is 23-120 days (average 50.1 days, median 39 days), and for cases with a laparoscopic approach, the period from surgery to discharge is 12-82 days (average 30 days). days, median 21 days). Discussion Spontaneous esophageal rupture develops various disease patterns such as mediastinum limited type with mild symptoms and intrathoracic rupture type. There are various treatment approaches, including conservative therapy, endoscopic closure, and surgery. The laparoscopic approach seemed to reduce the length of hospital stays. Conclusion The surgical approach for spontaneous esophageal rupture has been changed from thoracotomy to laparoscopic surgery. The trans hiatal procedure will increase among laparoscopic surgery. Spontaneous esophageal rupture is a remarkably highly invasive disease, and we thought that a less invasive and simpler treatment would be desirable.

The Role of Imaging in Diagnosis and Management of Diaphragmatic Hernia with Intestinal Occlusion: A Case Report

A diaphragmatic hernia is a condition characterized by a communication between the abdominal and thoracic cavities, with or without abdominal contents in the thorax. Diaphragmatic hernia with intestinal occlusion is rare and presents a significant diagnostic challenge that requires accurate and timely diagnosis for effective management. This article discusses the importance of various imaging modalities in diagnosing diaphragmatic hernia, particularly in identifying intestinal occlusion. Early recognition of this condition is crucial to prevent complications and improve patient outcomes.

214. THORACIC CAVITY/ CAGE RATIO IS PREDICTOR FOR SURGICAL DIFFICULTY OF MINIMALLY INVASIVE ESOPHAGECTOMY

Abstract Background Esophagectomy for esophageal cancer is highly invasive surgery. Minimally invasive esophagectomy (MIE) was introduced as a less invasive surgery, and conventional MIE (C-MIE) is being increasingly performed worldwide. Recently, robot-assisted MIE (RAMIE) was developed with the aim of further minimization of invasiveness, and is expected to spread in the future. When performing MIE, we sometimes experienced difficult cases. In this study, we aimed to clarify the factors related to surgical difficulty of MIE. Methods We evaluated 362 patients who underwent MIE (285 C-MIEs and 77 RAMIEs) for esophageal squamous cell carcinoma between April 2010 and February 2023. We used computed tomography to evaluate the occipitofrontal diameter of thoracic cavity and cage at brachiocephalic vein (BV), tracheal bifurcation (TB) and inferior right pulmonary vein (IRPV) levels, respectively. We calculated the thoracic cavity/cage ratio (TRRC) at each level. The cut-off values of TCCR at each level for thoracic procedure time were calculated using the receiver operating characteristic. Furthermore, total score consisted of four degrees (0,1,2,3) by the TCCR at three levels was calculated. We assessed clinicopathological and anatomical factors and determined the independent factors influencing the thoracic procedural time as parameter of difficulty in MIE. Results We divided the patients into C-MIE group and RAMIE group. Patients in each group were divided into two cohorts according to median thoracic procedure time (C-MIE: 307 and RAMIE: 409 minutes, respectively). In the C-MIE group, univariate analysis demonstrated that sex, body mass index (BMI), and the TCCR at BV, TB and IRPV levels were correlated with thoracic procedure time. The total TRRC score was also correlated with thoracic procedure time in univariate analysis. Next, multivariate analysis was done using sex, BMI, and the total TCCR score. Multivariate analyses demonstrated that BMI (p = 0.0005) and the total score (p = 0.0069) were independent factors for thoracic procedure time. In the RAMIE group, univariate analysis demonstrated that BMI and the TCCR at BV and TB levels were correlated with thoracic procedure time. Multivariate analyses demonstrated that the TCCR at TB level (p = 0.0187) was only independent factor for thoracic procedure time. Conclusions The TCCR and the total score based on it could be useful in assessing surgical difficulty of both C-MIE and RAMIE. C-MIE was affected by the diameter at all levels of the thoracic cavity due to restricted mobilities of thoracoscopic instruments. On the other hand, RAMIE’s articulated forceps prevent it from being affected by entire thoracic cavity. Consequently, only the TCCR at TB level, which is one of the most less flexible field, affects the difficulty in RAMIE.

537. ASSESSING THE EFFECT OF HIATAL HERNIA SIZE ON PERIOPERATIVE OUTCOMES AND HOSPITAL READMISSION RATES AFTER PRIMARY REPAIR

Abstract Background Minimally invasive hiatal hernia (HH) repair remains the gold standard for correcting mechanical defects due to its safety and favorable clinical outcomes (i.e., relief of patient symptoms). However, several operative factors, including the HH size, may negatively impact the postoperative course. We aimed to determine if an increase in HH size was related to an increased risk of perioperative complications or hospital readmissions. Methods After IRB approval, we performed a retrospective analysis using a prospectively maintained database containing demographic, perioperative, and clinical data from all patients who underwent HH repair by a single experienced foregut surgeon between September 2016 and July 2023. Four groups were defined based on the proportion of stomach at the thoracic cavity determined during the surgery: A (small HH: <25%), B (moderate HH: 25-49%), C (large HH: 50-74%), and D (intrathoracic stomach [ITS]: ≥75%). Non-parametric tests were used to assess differences between the groups, and logistic regressions were used to determine the relevant odds ratios (OR). Results A total of 391 patients who underwent primary HH repair met the inclusion criteria (73.7% women; mean age 64.4±12.5 years; mean BMI 28.9±4.9 kg/m2). The distribution of groups was: A (n=160, 40.9%), B (n=63, 16.1%), C (n=64, 16.4%), and D (n=104, 26.6%). Patients presenting with ITS (group D) were older, had longer operative duration, greater blood loss (p<.001), and a significantly increased risk of presenting with early postoperative complications (OR 2.78 [CI95: 1.52-5.06]) and being admitted to the ICU (OR 12.35 [CI95: 3.41-44.71]). Conclusion The HH size, defined by the proportion of the stomach at the thoracic cavity, is associated with an increased risk of early postoperative complications and ICU admission; moreover, a trend toward higher 30- and 90-day hospital readmission rates was noted. This factor may be a consequence of the progressive nature of the disease; hence, it should be considered when choosing between continued medical observation and surgical treatment of patients presenting with asymptomatic HH. An early intervention may reduce the risk of postoperative comorbidity.

Clinical anatomy of the right intercostal arteries: Another neighbor to know before pulmonary vein isolation

BackgroundHemothorax caused by a right intercostal artery (ICA) injury behind the left atrium (LA) is a potentially fatal complication during pulmonary vein isolation. However, their anatomic relationship has not been fully elucidated. ObjectiveThis study aimed to investigate the clinical anatomy of the right ICA in relation to the LA. MethodsThis retrospective study included 100 patients (70.2 ± 10.6 years; 39.0% female) who underwent cardiac computed tomography. The patients were divided into sinus rhythm and atrial fibrillation groups. We focused on the distance between the LA and right ICAs and its predictive factors. ResultsOn average, 3.7 ± 0.7 right ICAs were found behind the LA. Of these, the eighth ICA was the closest in 54% of the cases, followed by the seventh ICA in 29% and the ninth ICA in 14%. The average closest distance between them was 3.8 ± 3.8 mm, which was significantly shorter in the atrial fibrillation group than in the sinus rhythm group (3.0 ± 3.2 mm vs 4.7 ± 4.2 mm; P = .006). Multivariate analysis revealed that a thinner chest cavity (β = −0.512; P = .002) and LA dilation (β = −0.432; P = .001) were predictors of shorter distance. The closest points distributed along the vertebral column, generally near the inferior pulmonary vein orifices. ConclusionRight ICA-LA proximity was systematically clarified. Particularly in cases with an enlarged LA or thin chest cavity, operators should be aware of the potential risk of injuring the right ICA during pulmonary vein isolation.

510. INNOVATIVE ROBOTIC-ASSISTED ESOPHAGECTOMY WITH THREE-FIELD LYMPHADENECTOMY: A NOVEL APPROACH TO ESOPHAGEAL CANCER SURGERY

Abstract Background Esophageal squamous cell carcinoma, the predominant form of esophageal cancer in Thailand, often presents at advanced stages (III - IV), necessitating surgical intervention. Radical esophagectomy, including three-field lymphadenectomy, stands as one of the most invasive gastrointestinal surgeries. However, in the era of minimally invasive surgery (MIS), robotic systems have emerged as a formidable approach to achieve radical treatment goals while minimizing surgical invasiveness. This video showcases a novel surgical technique and its challenges. Methods A case of mid-thoracic esophageal squamous cell carcinoma, clinically staged III, treated via robotic-assisted esophagectomy and three-field lymphadenectomy using the Da Vinci Xi system. The operation encompassed three phases: Initially, the thoracic phase with patient in semi-prone position with three robotic and one assistant trocars for complete esophageal mobilization and mediastinal lymph node retrieval. The abdominal phase, followed by the cervical phase, utilized four robotic trocars and one assistant trocar in supine position with hyperextended neck, facilitating perigastric lymph node retrieval, gastric tube reconstruction via the posterior mediastinal route, and cervical esophago-gastric tube anastomosis using a circular stapler. Results The patient experienced an uneventful recovery. Postoperative esophagogastroduodenoscopy on day 1 revealed the integrity of the anastomosis and normal vocal cord function. Imaging conducted on day 7 confirmed that the anastomosis was patent without any leakage. Surgical outcomes included an operative time of 615 minutes, estimated blood loss of 150 ml, a 14-day hospital stay, and recovery without complications. This video highlights the intricacies of the procedure and the robotic system's ability to access anatomically challenging spaces, thereby minimizing surgical invasiveness and enhancing recovery. Conclusion The robotic system is capable of performing radical procedures in anatomically challenging areas, such as narrow spaces and areas requiring precise maneuverability among vital structures. It enables a comprehensive approach spanning from the upper to the lower thoracic regions and diversity of surgery in thoracic and abdominal cavity. Additionally, this presentation highlights unique surgical tips and techniques that enhance the safety and feasibility of robotic-assisted esophagectomy. By significantly reducing surgical errors and optimizing outcomes for both oncologic and minimally invasive surgeries, it thereby marks a significant leap forward in the field of esophageal surgery. https://drive.google.com/file/d/1vrmu2D8TGoetnplcREPWQocXJle4PrOX/view?usp=share_link

746. ESOPHAGECTOMY, WITH CHOLECYSTECTOMY HAS A HIGH INCIDENCE OF REFLUX ESOPHAGITIS AND GASTRIC TUBE ULCER

Abstract The surgical methods for thoracic esophageal cancer was subtotal esophagectomy, with gastric pull up via retrosternal route, and cervical anastomosis. However, some cases were complicated by acute cholecystitis in the early postoperative period, and cholecystectomy was performed intraoperatively to prevent postoperative cholecystitis in some cases. The disruption of normal anti-reflux mechanisms including the lower esophageal sphincter, angle of His, and diaphragmatic muscle and the denervation of the vagus nerve are generally thought to be the main factors that interfere with gastric motor function. Furthermore, the pressure difference between thoracic (negative) and abdominal cavity (positive) is another factor that promotes reflux across the anastomosis. Due to these factors, postoperative reflux esophagitis is frequently experienced. Furthermore, after cholecystectomy, due to loss of gallbladder reservoir function after cholecystectomy and decrease in antroduodenal motility, bile is not excreted by food intermittently but continuously, resulting in duodenogastric reflux. We investigated postoperative reflux esophagitis and gastric tube ulcers in cases with and without intraoperative cholecystectomy for the past three years. We investigated cholecystectomy with esophagectomy (n=65) and non-cholecystectomy with esophagectomy (n=101) in 166 cases of radical surgery for esophageal cancer in which 2-3 regions had been dissected in the past 3 years. As shown in Fig. 1, there are no differences in location, TNM, gender, and PPI administration .reflux esophagitis of the cervical esophagus is A:0 B:2 (3%), C:5 (8%), D:3 (5%) for chole(+), A:2 (2%), B:2 (2%), C:2 (2%), and D:2 (2%) for chole(-). Gastritis was Chole(+) superficial gastritis 14 (21%), metaplasia 4 (6%), chole(-) superficial gastritis 25 (25%), metaplasia 3 (2%). However, gastric tube ulcers occurred in 5 cases (7%) of Chole(+) and 1 case of perforation, while only 1 case (1%) of gastric tube ulcers occurred in Chole(-).. (Conclusion) Esophagectomy, gastric pull up with cholecystectomy has a high incidence of reflux esophagitis in the neck and can also cause ulcers in the gastric tube. Therefore, care should be taken in postoperative follow-up.

Pressure never sucks, pressure only pushes: a physiological exploration of the pushing power of pressure.

The movement of air into and out of the lungs is facilitated by changes in pressure within the thoracic cavity relative to atmospheric pressure, as well as the resistance encountered by airways. In this process, the movement of air into and out of the lungs is driven by pressure gradients established by changes in lung volume and intra-alveolar pressure. However, pressure never sucks! The concept that pressure never sucks, pressure only pushes encapsulates a fundamental principle in the behavior of gases. This concept challenges common misconceptions about pressure, shedding light on the dynamic forces that govern the movement of gases. In this Illumination, we explore the essence of this concept and its applications in pulmonary ventilation. Pressure is one of the most important concepts in physics and physiology. Atmospheric pressure at sea level is equal to 1 atmosphere or around 101,325 Pascal [Pa (1 Pa = 1 N/m2)]. This huge pressure is pushing down on everything all the time. However, this pressure is difficult to understand because we do not often observe the power of this incredible force. We used five readily available, simple, and inexpensive demonstrations to introduce the physics and power of pressure. This extraordinarily complex physics concept was approached in a straightforward and inexpensive manner while still providing an understanding of the fundamental concepts. These simple demonstrations introduced basic concepts and addressed common misconceptions about pressure.NEW & NOTEWORTHY The concept that pressure never sucks, pressure only pushes challenges common misconceptions about pressure, shedding light on the dynamic forces that govern the movement of gases. In this Illumination, we will explore the essence of this concept and its applications in pulmonary ventilation. Specifically, we used five readily available, simple, inexpensive demonstrations to introduce the physics and power of pressure.

447. SAFETY AND FEASIBILITY OF DOUBLE FLAP RECONSTRUCTION (KAMIKAWA TECHNIQUE) AS ANTI-REFLUX MECHANISM AFTER GASTROESOPHAGEAL SURGERY

Abstract Background Gastroesophageal reflux is a common adverse effect after oncological surgery for tumors of the gastroesophageal junction. Some of the reasons are the radicality of the intervention as well as the placement of the anastomosis inside the thoracic cavity, where there is a constant negative pressure. In recent years, multiple methods of digestive tract reconstruction have been developed in order to re-establish this anti-reflux mechanism, such as the double flap reconstruction, first described by Kamikawa, consisting of the creation of a seromuscular flap covering the anastomosis. Methods We designed a retrospective observational and descriptive study including all patients who underwent esophagogastric surgery and Kamikawa doble-flap reconstruction technique from January 2019 to January 2024. The operation conditions, postoperative recovery, postoperative complications (both short and mid-long term), and follow-up data were collected and analyzed. Quantitative variables are described as median and range, and qualitative variables as absolute number and percentage. The IBM SPSS Statistics 22 software was used for the descriptive part. Results We included a total of 10 patients in our series. All of them underwent an esophagogastric resection followed by a doble-flap reconstruction technique. Thoracoscopy in prone position was the approach used in most of the patients. In these cases, the doble flap was performed using the posterior wall of the gastric remnant. Half of the patients had no postoperative complications and the other half, mild ones. Postoperative manometry and pHmetry were only performed in 4 patients due to technical difficulties. In all these cases the tests showed no alterations. Despite this, one patient reported reflux, which was controlled with PPIs. Conclusions The double flap reconstructive technique is a useful tool that can be applied to those patients undergoing an aggressive procedure in the gastroesophageal junction in order to restore its valvular mechanism. It can be performed through different approaches that best fit each surgical scenario. It does not bear greater postoperative complications than standard procedures and may prove to be a good option to improve the quality of life of selected patients.

Complex Hiatal Hernia with Gastric Volvulus Successfully Managed by Hiatal Plasty and Nissen Fundoplication: A Case Report

Background: Hiatal hernias, particularly those complicated by gastric volvulus, represent a rare but potentially life-threatening condition. Prompt diagnosis and surgical intervention are crucial to prevent severe complications such as strangulation and ischemia of the stomach. This case report details the presentation, diagnosis, and successful surgical management of a Type IV hiatal hernia with an associated gastric volvulus using hiatal plasty and Nissen fundoplication. Case Presentation: We present the case of a 65-year-old male with a history of recurrent epigastric pain, nausea, and postprandial vomiting, who was diagnosed with a Type IV hiatal hernia complicated by an organoaxial gastric volvulus. Imaging studies confirmed the diagnosis, revealing significant herniation of the stomach into the thoracic cavity. The patient underwent elective surgical repair involving a hiatal plasty to restore the diaphragmatic hiatus, followed by a Nissen fundoplication to prevent recurrence. Postoperative recovery was uneventful, with resolution of symptoms and no recurrence at a six-month follow-up. Conclusion: This case underscores the importance of timely recognition and appropriate surgical management of hiatal hernias complicated by gastric volvulus. The combined approach of hiatal plasty and Nissen fundoplication provides effective relief and prevents recurrence, contributing to favorable long-term outcomes.

Hérnia diafragmática traumática em cão

The term diaphragmatic hernia refers to rupture of the diaphragm, the muscle that separates the thoracic and abdominal cavities. The diaphragm plays an important role in ventilation, serving as an inspiratory muscle, in addition to helping transport lymphatic fluid. Most diaphragmatic hernias in dogs and cats are caused by trauma, particularly being run over by a car. They are frequently diagnosed in small animal clinics and there is no age or species predisposition for traumatic diaphragmatic hernias. Symptoms vary but include difficulty breathing, tachypnea, pale or cyanotic mucous membranes, tachycardia and oliguria. The definitive diagnosis is confirmed by the combination of a well performed anamnesis and imaging tests such as radiography and ultrasound. The recommended treatment is surgery, with diaphragm surgery, combines with follow-up and post-operative care to ensure a good recovery. This work reports the case of a female puppy, ran over by a vehicle. After imaging tests, she was diagnosed with a diaphragmatic hernia and subsequently underwent diaphragmatic herniorrhaphy, a diaphragm correction procedure. The surgical procedure and the patient's recovery went well, without complications.